add test git status file
add undo file
add undo file test
Revert "add undo file test"

This reverts commit 4ce1c961e09be3375a729ffbf97de64d60d1b937.
add git reset file test
make some change to git_reset2.txt
edit git_reset1.txt
add-new-feature.txt in new-feature branch
add-new-feature2.txt in new-feature branch
add ad_feature_test1.txt in new-feature branch with 3-Way Merge
add add_feature_test2.txt in new-feature branch with 3-Way Merge
add new feature file in master.
Merge branch 'new-feature'
add git-commit-amend.txt to master
add git-commit-amend2.txt to master
first add a file,test git commit amend
Fix security hole
add new function in new feature brank
Merge branch 'release-0.2'
add fix bug 100